API Marketplace
Curated public APIs — finance, news, weather, crypto and more — callable through one x402 payment. No API keys, no signups: pay $0.01, get data. Every call is also a live probe.
| API | Category | Auth | Price | Probes | Status |
|---|---|---|---|---|---|
| COREAccess the world's Open Access research papers | Science & Math | apikey | $0.02 | 1/1 | live |
| CodeCogsRender LaTeX equations in PNG, GIF, SVG, EMF, PDF, JSON, or download formats wit | Science & Math | none | $0.01 | 1/1 | live |
| CycleCalcsInterpreted astronomy: sun and moon times, moon phases, planets, eclipses, seaso | Science & Math | none | $0.01 | 1/1 | live |
| Europe PMCLife-science literature search with abstracts, citations and full-text links | Science & Math | none | $0.01 | 1/1 | live |
| GBIFGlobal Biodiversity Information Facility | Science & Math | none | $0.01 | 1/1 | live |
| ISROISRO Space Crafts Information | Science & Math | none | $0.01 | 1/1 | live |
| ITISIntegrated Taxonomic Information System | Science & Math | none | $0.01 | 1/1 | live |
| Launch Library 2Spaceflight launches and events database | Science & Math | none | $0.01 | 1/1 | live |
| Materials Platform for Data ScienceCurated experimental data for materials science | Science & Math | apikey | $0.02 | 1/1 | live |
| Minor Planet CenterAsterank.com Information | Science & Math | none | $0.01 | 1/1 | live |
| NASANASA data, including imagery | Science & Math | none | $0.01 | 1/1 | live |
| NASA ADSNASA Astrophysics Data System | Science & Math | oauth | $0.02 | 1/1 | live |
| NewtonSymbolic and Arithmetic Math Calculator | Science & Math | none | $0.01 | 1/1 | live |
| NumbersNumber of the day, random number, number facts and anything else you want to do | Science & Math | apikey | $0.02 | 1/1 | live |
| NumbersFacts about numbers | Science & Math | none | $0.01 | 1/1 | live |
| Ocean FactsFacts pertaining to the physical science of Oceanography | Science & Math | none | $0.01 | 1/1 | live |
| Open NotifyISS astronauts, current location, etc | Science & Math | none | $0.01 | 1/1 | live |
| Open Science FrameworkRepository and archive for study designs, research materials, data, manuscripts, | Science & Math | none | $0.01 | 1/1 | live |
| OpenAlexOpen catalog of scholarly works, authors, institutions, sources, and concepts | Science & Math | none | $0.01 | 1/1 | live |
| OrbitalWikiCatalog of 16,000+ satellites merging CelesTrak, GCAT, Wikidata; free tier inclu | Science & Math | apikey | $0.02 | 1/1 | live |
| Purple AirReal Time Air Quality Monitoring | Science & Math | none | $0.01 | 1/1 | live |
| SHAREA free, open, dataset about research and scholarly activities | Science & Math | none | $0.01 | 1/1 | live |
| SpaceXGraphQL, Company, Ships, launchpad and launch data | Science & Math | none | $0.01 | 1/1 | live |
| Sunrise and SunsetSunset and sunrise times for a given latitude and longitude | Science & Math | none | $0.01 | 1/1 | live |
| TLESatellite information | Science & Math | none | $0.01 | 1/1 | live |
| TallytopiaCalculators for finance, health, math, space and sports with step-by-step result | Science & Math | none | $0.01 | 1/1 | live |
| USGS Earthquake Hazards ProgramEarthquakes data real-time | Science & Math | none | $0.01 | 1/1 | live |
| USGS Water ServicesWater quality and level info for rivers and lakes | Science & Math | none | $0.01 | 1/1 | live |
| VedIntel™ AstroAPIVedic astrology computation — birth charts, dashas, panchang, AI narratives | Science & Math | apikey | $0.02 | 1/1 | live |
| World BankWorld Data | Science & Math | none | $0.01 | 1/1 | live |
| arXivCurated research-sharing platform: physics, mathematics, quantitative finance, a | Science & Math | none | $0.01 | 1/1 | live |
| arcsecond.ioMultiple astronomy data sources | Science & Math | none | $0.01 | 1/1 | live |
| isEven (humor)Check if a number is even | Science & Math | none | $0.01 | 1/1 | live |
| xMathRandom mathematical expressions | Science & Math | none | $0.01 | 1/1 | live |
GET /api/market # catalog (free) GET /api/market/<id>/call?path=/v1/endpoint&foo=bar # 402 → pay $0.01 USDC/USDT → retry # x-payment-tx: BASE:<txHash> # x-agent-wallet: <yourWallet> → first 3 calls free # x-ref: <referrerWallet> → they earn 5%, you pay same